aboutsummaryrefslogtreecommitdiff
path: root/platform/stm32f0xx/uart.c
diff options
context:
space:
mode:
Diffstat (limited to 'platform/stm32f0xx/uart.c')
-rw-r--r--platform/stm32f0xx/uart.c271
1 files changed, 0 insertions, 271 deletions
diff --git a/platform/stm32f0xx/uart.c b/platform/stm32f0xx/uart.c
deleted file mode 100644
index 24ee359d..00000000
--- a/platform/stm32f0xx/uart.c
+++ /dev/null
@@ -1,271 +0,0 @@
-/*
- * Copyright (c) 2012 Kent Ryhorchuk
- * Copyright (c) 2016 Erik Gilling
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files
- * (the "Software"), to deal in the Software without restriction,
- * including without limitation the rights to use, copy, modify, merge,
- * publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
- * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-#include <arch/arm/cm.h>
-#include <assert.h>
-#include <dev/uart.h>
-#include <lib/cbuf.h>
-#include <platform/rcc.h>
-#include <stdint.h>
-#include <stm32f0xx.h>
-
-typedef USART_TypeDef stm32_usart_t;
-
-#define RXBUF_SIZE 16
-
-#ifdef ENABLE_UART1
-cbuf_t uart1_rx_buf;
-#ifndef UART1_FLOWCONTROL
-#define UART1_FLOWCONTROL 0x0
-#endif
-#endif
-
-#ifdef ENABLE_UART2
-cbuf_t uart2_rx_buf;
-#ifndef UART2_FLOWCONTROL
-#define UART2_FLOWCONTROL 0x0
-#endif
-#endif
-
-#ifdef ENABLE_UART3
-cbuf_t uart3_rx_buf;
-#ifndef UART3_FLOWCONTROL
-#define UART3_FLOWCONTROL 0x0
-#endif
-#endif
-
-#ifdef ENABLE_UART1
-#endif
-#ifdef ENABLE_UART2
-#endif
-#ifdef ENABLE_UART3
-#endif
-
-static void stm32_usart_init1_early(stm32_usart_t *usart,
- uint16_t flow_control, int irqn)
-{
- uint32_t baud_rate = 115200;
-
- // Ensure USART is disabled before configuring it.
- usart->CR1 = 0;
-
- // Set stop bits to 1 (CR2[13:12] = 00b)
- usart->CR2 = 0;
-
-
- // Go with the defaults of:
- // word length: 8 bits
- // parity: disabled
- // Enable TX and RX.
- usart->CR1 = USART_CR1_TE | USART_CR1_RE;
-
- usart->CR3 = flow_control;
-
- // TODO(konkers): Add rcc API for querying clock freq.
- uint32_t apb_clock = 48000000;
-
- usart->BRR = (apb_clock + baud_rate / 2) / baud_rate;
-
- // Leave IRQs disabled until init.
- NVIC_DisableIRQ(irqn);
-
- // Enable UART.
- usart->CR1 |= USART_CR1_UE;
-}
-
-static void stm32_usart_init1(stm32_usart_t *usart, int irqn, cbuf_t *rxbuf)
-{
- cbuf_initialize(rxbuf, RXBUF_SIZE);
- // Enable RX not empty interrupt.
- usart->CR1 |= USART_CR1_RXNEIE;
- NVIC_EnableIRQ(irqn);
-}
-
-void uart_init_early(void)
-{
-#ifdef ENABLE_UART1
- stm32_rcc_set_enable(STM32_RCC_CLK_USART1, true);
-#endif
-#ifdef ENABLE_UART2
- stm32_rcc_set_enable(STM32_RCC_CLK_USART2, true);
-#endif
-#ifdef ENABLE_UART3
- stm32_rcc_set_enable(STM32_RCC_CLK_USART3, true);
-#endif
-
-#ifdef ENABLE_UART1
- stm32_usart_init1_early(USART1, UART1_FLOWCONTROL, USART1_IRQn);
-#endif
-#ifdef ENABLE_UART2
- stm32_usart_init1_early(USART2, UART2_FLOWCONTROL, USART2_IRQn);
-#endif
-#ifdef ENABLE_UART3
- stm32_usart_init1_early(USART3, UART3_FLOWCONTROL, USART3_IRQn);
-#endif
-}
-
-void uart_init(void)
-{
-#ifdef ENABLE_UART1
- stm32_usart_init1(USART1, USART1_IRQn, &uart1_rx_buf);
-#endif
-#ifdef ENABLE_UART2
- stm32_usart_init1(USART2, USART2_IRQn, &uart2_rx_buf);
-#endif
-#ifdef ENABLE_UART3
- stm32_usart_init1(USART3, USART3_IRQn, &uart3_rx_buf);
-#endif
-}
-
-// I'm seeing a weird issue with my nucleo-f072rb board where rx interrupts
-// don't fire right after a reset by the on board programmer. If I hit
-// the reset button, rx works fine. I can live with this. YMMV.
-static void stm32_uart_rx_irq(stm32_usart_t *usart, cbuf_t *rxbuf)
-{
- arm_cm_irq_entry();
-
- bool resched = false;
- while (usart->ISR & USART_ISR_RXNE) {
- if (!cbuf_space_avail(rxbuf)) {
- // Overflow - let flow control do its thing by not
- // reading the from the FIFO.
- usart->CR1 &= ~USART_CR1_RXNEIE;
- break;
- }
-
- char c = usart->RDR;
- cbuf_write_char(rxbuf, c, false);
- resched = true;
- }
-
- arm_cm_irq_exit(resched);
-}
-
-#ifdef ENABLE_UART1
-void stm32_USART1_IRQ(void)
-{
- stm32_uart_rx_irq(USART1, &uart1_rx_buf);
-}
-#endif
-
-#ifdef ENABLE_UART2
-void stm32_USART2_IRQ(void)
-{
- stm32_uart_rx_irq(USART2, &uart2_rx_buf);
-}
-#endif
-
-#ifdef ENABLE_UART3
-void stm32_USART3_IRQ(void)
-{
- stm32_uart_rx_irq(USART3, &uart3_rx_buf);
-}
-#endif
-
-
-static void stm32_usart_putc(stm32_usart_t *usart, char c)
-{
- while ((usart->ISR & USART_ISR_TXE) == 0);
- usart->TDR = c;
- while ((usart->ISR & USART_ISR_TC) == 0);
-}
-
-static int stm32_usart_getc(stm32_usart_t *usart, cbuf_t *rxbuf, bool wait)
-{
- char c;
- cbuf_read_char(rxbuf, &c, wait);
- if (cbuf_space_avail(rxbuf) > RXBUF_SIZE/2)
- usart->CR1 |= USART_CR1_RXNEIE;
-
- return c;
-}
-
-static stm32_usart_t *stm32_get_usart(int port)
-{
- switch (port) {
-#ifdef ENABLE_UART1
- case 1:
- return USART1;
-#endif
-#ifdef ENABLE_UART2
- case 2:
- return USART2;
-#endif
-#ifdef ENABLE_UART3
- case 3:
- return USART3;
-#endif
- default:
- ASSERT(false);
- return 0;
- }
-
-}
-
-static cbuf_t *stm32_get_rxbuf(int port)
-{
- switch (port) {
-#ifdef ENABLE_UART1
- case 1:
- return &uart1_rx_buf;
-#endif
-#ifdef ENABLE_UART2
- case 2:
- return &uart2_rx_buf;
-#endif
-#ifdef ENABLE_UART3
- case 3:
- return &uart3_rx_buf;
-#endif
- default:
- ASSERT(false);
- return 0;
- }
-
-}
-
-int uart_putc(int port, char c)
-{
- stm32_usart_t *usart = stm32_get_usart(port);
- stm32_usart_putc(usart, c);
- return 1;
-}
-
-int uart_getc(int port, bool wait)
-{
- cbuf_t *rxbuf = stm32_get_rxbuf(port);
- stm32_usart_t *usart = stm32_get_usart(port);
-
- return stm32_usart_getc(usart, rxbuf, wait);
-}
-
-void uart_flush_tx(int port) {}
-
-void uart_flush_rx(int port) {}
-
-void uart_init_port(int port, uint baud)
-{
- // TODO - later
- PANIC_UNIMPLEMENTED;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-31 04:40:45 +0000